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Aim and background: The use of denture cleanser is mandatory in order to keep the denture hygienic and free of micro-organisms but should not have adverse effects on the properties of denture base material. This study aims to evaluate the effect of different cleansing solutions on hardness property of two denture base materials. Materials and Methods: Seventy specimens have been prepared in dimensions(30*10*2.5)mm, length width and thickness respectively, from two denture base materials(heat-cured acrylic resin and flexible denture base materials). Each had thirty five specimens. These specimens were divided into three groups of cleansers( thyme oil+soda, vinegar+soda and commercial cleanser Kinpro tablet) along with a forth solution as a control group(distilled water). Each group had two immersion periods( thirty minutes and eight hours) in which the cleansers were daily exchanged for a month, while control group had 24 hours immersion and exchanged daily for a month. prior to immersion, hardness property was measured for each sample and after the end of the month, hardness was measured again using Shore D hardness tester. T-test and One Way Analysis of Variance were used to analyze data and determine the significance between the groups at P ≤ 0.05 Results: T-test analysis showed that there were insignificant differences between groups( before and after immersion) in all denture cleansers groups and in both denture base materials. Analysis of variance also showed insignificant differences between denture cleansers groups. In flexible denture base materials, the natural cleansers showed less hardness values than control group, while in heat-cured acrylic resin it was increased in relation to control group. conclusion: From the results of this study it was concluded that no significant change in mean hardness was observed and that eight hours immersion period showed higher hardness means than 30 minutes period except for clear vinegar+soda in flexible denture base material.

EVALUATION OF THE EFFECT OF SOME DENTURE CLEANSERS ON THE HARDNESS OF TWO DENTURE BASE MATERIALS